[BatGuano]

Don’t mess with that compound, it can kill people and dissolve rocks. There should be a HAZMAT warning on all containers.
Chemistry 101.

[LOC1]

W. C. Fields had something to say about that compound, to the effect that you should not drink it because fish do nasty things in it.

[SaxxonWoods]

FACT CHECK: Is Dihydrogen Monoxide Dangerous?
https://www.snopes.com/fact-check/dangers-dihydrogen-monoxide

Despite rumors, the dihydrogen monoxide hoax shows that even the most innocuous of substances can be made to sound like a dangerous threat to human life.